N^G-Acylated Imidazolylpropylguanidines as Potent Histamine H₄Receptor Agonists: Selectivity by Variation of theN^G-Substituent

N^G-Acylated Imidazolylpropylguanidines as Potent Histamine H₄Receptor Agonists: Selectivity by Variation of theN^G-Substituent Synthesis and Structure−Activity Relationships of Cyanoguanidine-Type and Structurally Related Histamine H₄Receptor Agonists Synthesis, SAR and selectivity of 2-acyl- and 2-cyano-1-hetarylalkyl-guanidines at the four histamine receptor subtypes: a bioisosteric approach Conformational Restriction and Enantioseparation Increase Potency and Selectivity of Cyanoguanidine-Type Histamine H₄Receptor Agonists Acylguanidines as Bioisosteres of Guanidines:N^G-Acylated Imidazolylpropylguanidines, a New Class of Histamine H₂Receptor Agonists Chiral NG-acylated hetarylpropylguanidine-type histamine H2 receptor agonists do not show significant stereoselectivity A Selective Human H₄-Receptor Agonist:  (−)-2-Cyano-1-methyl-3-{(2R,5R)-5- [1H-imidazol-4(5)-yl]tetrahydrofuran-2-yl}methylguanidine Homologs of Histamine as Histamine H3 Receptor Antagonists: A New Potent and Selective H3 Antagonist, 4(5)-(5-Aminopentyl)-1H-imidazole Agonist/antagonist modulation in a series of 2-aryl benzimidazole H4 receptor ligands N^α-Imidazolylalkyl and Pyridylalkyl Derivatives of Histaprodifen:  Synthesis and in Vitro Evaluation of Highly Potent Histamine H₁-Receptor Agonists